ICMP Echo Requests

The target is capable of receiving externally generated ICMP Echo Request messages and replying them accordingly.

Furthermore, the ICMP API function NetICMP_TxEchoReq allows a network application to send Echo Requests to a remote host. The following listing shows an example of an application function to send ping request:

Listing - NetApp_TxPing()

CPU_BOOLEAN  NetApp_TxPing (NET_IP_ADDR_FAMILY   ip_family, 
                            void                *p_addr_remote,
                            CPU_INT08U           addr_len,
                            void                *p_data,
                            CPU_INT16U           data_len,
                            CPU_INT32U           timeout_ms,
                            CPU_INT32U           cnt)
{    
    CPU_INT32U           ix;
    NET_ERR              net_err;
    
                                                                /* ---------------- VALIDATE IP FAMILY ---------------- */
    if (ip_family == NET_IP_ADDR_FAMILY_IPv4) {
#ifndef NET_IPv4_MODULE_EN
        return (DEF_FAIL);
#endif
        if (addr_len != NET_IPv4_ADDR_SIZE) {
            return (DEF_FAIL);
        }
    } else if (ip_family == NET_IP_ADDR_FAMILY_IPv6) {
#ifndef NET_IPv6_MODULE_EN
        return (DEF_FAIL);
#endif
        if (addr_len != NET_IPv6_ADDR_SIZE) {
            return (DEF_FAIL);
        }
    } else {
        return (DEF_FAIL);
    }
                                                                /* ----------------- SEND ECHO REQUEST ---------------- */
    for (ix = 0 ; ix < cnt ; ix++) {
        (void)NetICMP_TxEchoReq(p_addr_remote,
                                addr_len,
                                timeout_ms,
                                p_data,
                                data_len,
                               &net_err);
    }
    switch(net_err) {
        case NET_ICMP_ERR_NONE:
             break;
             
        case NET_ICMP_ERR_SIGNAL_TIMEOUT:
        case NET_ERR_IF_LINK_DOWN:
        default:
             return (DEF_FAIL);
    }
    return (DEF_OK);
}